סי' ו קרא את יהושע

The Book Yerech HaAisonim — in it are explained many wondrous matters from the topic of the holiness of Rosh HaShanah and the sounding of the Shofar and the prayers of Rosh HaShanah, and the great merit of one who is privileged to be near a true Tzadik on Rosh HaShanah, and the topic of the custom that was practiced to go on Erev Rosh HaShanah to pray at the graves of the Tzadikim; and likewise explained within it are the topics of the holiness of the Ten Days of Repentance, Yom Kippur, Sukkos, Sh'mini Atzeres, and Simchas Torah, and the holiness of all the mitzvos of G-d which are observed during them.

The matter of Rosh HaShanah, Yom Kippur, Sukkos, etc., is explained well through this discourse in Likutay Halachos: Laws of Shabbos, Law 7, and in Laws of Rosh HaShanah, Law 7 — see there. Rabbi Nachman of Tchehrin defers here entirely to Rabbi Nosson of Breslov's Likutay Halachos, in keeping with his stated principle of not elaborating where the holy Anshay Shlom of Breslov have already done so. The reader is encouraged to study those sections.